Steam's explanation is below.
I suspect the game was just too gorey. Note that the game isn't out yet, and I saw no indication that the authors of the article had played or seen it.
After review, we will not be able to ship your game HORSES on Steam. While we strive to ship most titles submitted to us, we found that this title features themes, imagery, or descriptions that we won’t distribute. Regardless of a developer’s intentions with their product, we will not distribute content that appears, in our judgment, to depict sexual conduct involving a minor. While every product submitted is unique, if your product features this representation—even in a subtle way that could be defined as a ‘grey area’—it will be rejected by Steam. For instance, setting your game in a high school but declaring your characters are of legal age would fall into that category and be banned. This app has been banned and cannot be reused. Re-submissions of this app, even with modifications, will not be accepted.
Windows 98 had god usability. The buttons and controls all had borders, so you could know where they are. In Windows 11, everything is flat, nothing has a border, so you can never know where the interactive area is.